If you mean droplets, the answer is surface tension. Water molecules are attracted to each other, like magnets. The molecules on the surface, wether the surface of a glass of water or the surface of a droplet, will have a tendency to bind to one another.
If you mean droplets, the answer is surface tension. Water molecules are attracted to each other, like magnets. The molecules on the surface, wether the surface of a glass of water or the surface of a droplet, will have a tendency to bind to one another.